/*
 * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
 *
 * This software is open source.
 * See the bottom of this file for the licence.
 */

package org.dom4j.jaxb;

import java.io.StringReader;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;

import org.dom4j.dom.DOMDocument;

/**
 * DOCUMENT ME!
 * 
 * @author Wonne Keysers (Realsoftware.be)
 */
abstract class JAXBSupport
{
   private String contextPath;

   private ClassLoader classloader;

   private JAXBContext jaxbContext;

   private Marshaller marshaller;

   private Unmarshaller unmarshaller;

   public JAXBSupport(String contextPath)
   {
      this.contextPath = contextPath;
   }

   public JAXBSupport(String contextPath, ClassLoader classloader)
   {
      this.contextPath = contextPath;
      this.classloader = classloader;
   }

   /**
    * Marshals the given {@link javax.xml.bind.Element}in to its DOM4J
    * counterpart.
    * 
    * @param element JAXB Element to be marshalled
    * 
    * @return the marshalled DOM4J {@link org.dom4j.Element}
    * 
    * @throws JAXBException when an error occurs
    */
   protected org.dom4j.Element marshal(javax.xml.bind.Element element)
      throws JAXBException
   {
      DOMDocument doc = new DOMDocument();
      getMarshaller().marshal(element, doc);

      return doc.getRootElement();
   }

   /**
    * Unmarshalls the specified DOM4J {@link org.dom4j.Element}into a {@link
    * javax.xml.bind.Element}
    * 
    * @param element the DOM4J element to unmarshall
    * 
    * @return the unmarshalled JAXB object
    * 
    * @throws JAXBException when an error occurs
    */
   protected javax.xml.bind.Element unmarshal(org.dom4j.Element element)
      throws JAXBException
   {
      Source source = new StreamSource(new StringReader(element.asXML()));

      return (javax.xml.bind.Element) getUnmarshaller().unmarshal(source);
   }

   private Marshaller getMarshaller() throws JAXBException
   {
      if(marshaller == null)
      {
         marshaller = getContext().createMarshaller();
      }

      return marshaller;
   }

   private Unmarshaller getUnmarshaller() throws JAXBException
   {
      if(unmarshaller == null)
      {
         unmarshaller = getContext().createUnmarshaller();
      }

      return unmarshaller;
   }

   private JAXBContext getContext() throws JAXBException
   {
      if(jaxbContext == null)
      {
         if(classloader == null)
         {
            jaxbContext = JAXBContext.newInstance(contextPath);
         }
         else
         {
            jaxbContext = JAXBContext.newInstance(contextPath, classloader);
         }
      }

      return jaxbContext;
   }
}

/*
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided that the
 * following conditions are met:
 * 
 * 1. Redistributions of source code must retain copyright statements and
 * notices. Redistributions must also contain a copy of this document.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 
 * 3. The name "DOM4J" must not be used to endorse or promote products derived
 * from this Software without prior written permission of MetaStuff, Ltd. For
 * written permission, please contact dom4j-info@metastuff.com.
 * 
 * 4. Products derived from this Software may not be called "DOM4J" nor may
 * "DOM4J" appear in their names without prior written permission of MetaStuff,
 * Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
 * 
 * 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
 * 
 * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
 */
